WSJT-X/lib/fsk4hf/wsprdpsk_params.f90

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parameter (KK=64) !Information bits (50 + CRC14) ?
parameter (ND=200) !Data symbols: LDPC (204,68), r=1/3, don't send last 4 bits
parameter (NS=32) !Sync symbols (32)
parameter (NN=NS+ND) !Total symbols (232)
parameter (NSPS0=6000) !Samples per symbol at 12000 S/s
parameter (NDOWN=30) !Downsample to 200 sa/symbol (400 Hz) for candidate selection
parameter (NSPS=NSPS0/NDOWN) !Samples per symbol (200)
parameter (NZ=NSPS*NN) !Samples in baseband waveform
parameter (NZ0=NSPS0*NN) !Samples in waveform at 12000 S/s
parameter (NFFT1=4*NSPS,NH1=NFFT1/2)